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Red ball... Red ball (Posted on 2002-10-17) Difficulty: 4 of 5
If you take two balls randomly out of a jar of colored balls, there is a 50% chance that the balls will both be red.

What is the total percentage of red balls in the jar?

See The Solution Submitted by levik    
Rating: 3.1538 (13 votes)

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Solution solution | Comment 6 of 15 |
if p is percentage of red balls in the jar, probability that a randomly picked ball is red = p.
for 2 balls picked at random to be red , probability is p*p = 1/2.
Hence , percentage of red balls is square root of 1/2 or 70.7%
  Posted by Keedom on 2002-11-18 23:43:54
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